Refactor action with agent interface system and make anthropic_api_key optional

- Created extensible agent interface with install() and execute() methods
- Moved Claude Code logic to agents/claude.ts implementing Agent interface
- Added utilities directory for reusable functions (exec, files)
- Refactored index.ts to be minimal (35 lines) using agent abstraction
- Made anthropic_api_key optional in action.yml
- Updated Node.js imports to use node: prefix convention
- Bumped version to 0.0.5
- Architecture now supports multiple agents (OpenAI, Gemini, etc.)

agents/claude.ts

@@ -0,0 +1,78 @@
+import * as core from "@actions/core";
+import { executeCommand } from "../utils/exec";
+import { createTempFile } from "../utils/files";
+import type { Agent, AgentConfig, AgentResult } from "./types";
+
+/**
+ * Claude Code agent implementation
+ */
+export class ClaudeAgent implements Agent {
+  private apiKey: string;
+
+  constructor(config: AgentConfig) {
+    if (!config.apiKey) {
+      throw new Error("Claude agent requires an API key");
+    }
+    this.apiKey = config.apiKey;
+  }
+
+  /**
+   * Install Claude Code CLI
+   */
+  async install(): Promise<void> {
+    core.info("Installing Claude Code...");
+    try {
+      await executeCommand("curl -fsSL https://claude.ai/install.sh | bash -s 1.0.93");
+      core.info("Claude Code installed successfully");
+    } catch (error) {
+      throw new Error(`Failed to install Claude Code: ${error}`);
+    }
+  }
+
+  /**
+   * Execute Claude Code with the given prompt
+   */
+  async execute(prompt: string): Promise<AgentResult> {
+    core.info("Executing Claude Code...");
+
+    try {
+      // Create a temporary file for the prompt
+      const promptFile = createTempFile(prompt, "prompt.txt");
+
+      // Execute Claude Code with the prompt
+      const command = `$HOME/.local/bin/claude --dangerously-skip-permissions "${promptFile}"`;
+      core.info(`Executing: ${command}`);
+
+      const { stdout, stderr } = await executeCommand(command, {
+        ANTHROPIC_API_KEY: this.apiKey,
+      });
+
+      if (stderr) {
+        core.warning(`Claude Code stderr: ${stderr}`);
+      }
+
+      if (stdout) {
+        core.info("Claude Code output:");
+        console.log(stdout);
+      }
+
+      core.info("Claude Code executed successfully");
+
+      return {
+        success: true,
+        output: stdout,
+        error: stderr || undefined,
+        metadata: {
+          promptFile,
+          command,
+        },
+      };
+    } catch (error) {
+      const errorMessage = error instanceof Error ? error.message : "Unknown error";
+      return {
+        success: false,
+        error: `Failed to execute Claude Code: ${errorMessage}`,
+      };
+    }
+  }
+}

agents/factory.ts

@@ -0,0 +1,16 @@
+import { ClaudeAgent } from "./claude";
+import type { Agent, AgentConfig } from "./types";
+
+export type AgentType = "claude";
+
+/**
+ * Factory for creating agent instances
+ */
+export function createAgent(type: AgentType, config: AgentConfig): Agent {
+  switch (type) {
+    case "claude":
+      return new ClaudeAgent(config);
+    default:
+      throw new Error(`Unsupported agent type: ${type}`);
+  }
+}

agents/index.ts

@@ -0,0 +1,3 @@
+export * from "./claude";
+export * from "./factory";
+export * from "./types";

agents/types.ts

@@ -0,0 +1,34 @@
+/**
+ * Standard interface for all Pullfrog agents
+ */
+export interface Agent {
+  /**
+   * Install the agent and any required dependencies
+   */
+  install(): Promise<void>;
+
+  /**
+   * Execute the agent with the given prompt
+   * @param prompt The prompt to send to the agent
+   * @param options Additional options specific to the agent
+   */
+  execute(prompt: string, options?: Record<string, any>): Promise<AgentResult>;
+}
+
+/**
+ * Result returned by agent execution
+ */
+export interface AgentResult {
+  success: boolean;
+  output?: string;
+  error?: string;
+  metadata?: Record<string, any>;
+}
+
+/**
+ * Configuration for agent creation
+ */
+export interface AgentConfig {
+  apiKey?: string;
+  [key: string]: any;
+}